ASA doesn't have an integrated tracking tool for historical access.
What may fit best is to have an external authentication AAA server, ei. Cisco ACS, and check the log of VPN access on the server itself.

Also what you can do is to send all syslog messages to a syslog server and then filter the ones for authentication.
The latter I havent tested and also is a big operational burden for the admin to filter syslogs.

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After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

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